Yeah, I went to see it. The first time I've gone to see a Hollywood movie in theaters since Avengers: Endgame. I had basically sworn that off, though a time to see the first three on a free streaming service did provide me with good entertainment, so I knew what to expect, and I was not disappointed at all. Over the top violent fun, "toxic masculinity" abound, and a couple of plot points that just don't make any goddamn sense.
I wanted to like "Nobody," but I don't think there was enough explanation behind him to make his actions make sense. At the very least, his action scenes with his dog were much better than the Halle Berry rinse & repeat from 3. I always liked the "old badass" look Hiroyuki Sanada has going for him ever since The Last Samurai. There is a "strong female character," but she's not a "girl boss that only excels so that male characters are brought down;" she has to play to her own strengths to get the upper hand as she does, and has to struggle to do so. Actually, one of the most impressive things I saw in this movie was a strange turnabout as John is chasing down a fat bastard mafioso, when suddenly, the fat bastard actually fights back EXTREMELY WELL.
No cliffhanger on this one. The story is wrapped up unless they pull some really screwy shit. But hey, it's John Wick, it wouldn't be the first time.
The first one works extremely well as its own thing. The second movie sets up a bunch of stuff that doesn't get resolved until the fourth film. The tone also changes quite a bit from what I'd call a grounded action film to be quite a bit more over-the-top, which is a bit jarring at times.
I like all four movies, and can't find much to complain about outside the middle of the second and third (barring the aforementioned shift in tone.) If you like over-the-top action and violence, I'd highly recommend the rest of the series. If that's not your style, I'd suggest sticking with the first.